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Showing 1 - 54 of 54 Journals sorted alphabetically
Accounts of Chemical Research     Full-text available via subscription   (Followers: 136)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 31)
American Journal of Analytical Chemistry     Open Access   (Followers: 34)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 31)
Analytical and Bioanalytical Chemistry Research     Open Access  
Analytical Chemistry     Full-text available via subscription   (Followers: 274)
Analytical Chemistry Insights     Open Access   (Followers: 24)
Analytical Chemistry Letters     Hybrid Journal  
Analytical Chemistry Research     Open Access   (Followers: 9)
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 12)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 11)
Biomonitoring     Open Access   (Followers: 2)
Chemical Data Collections     Hybrid Journal  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 4)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 3)
Composites Communications     Full-text available via subscription   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 6)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 27)
Current Analytical Chemistry     Hybrid Journal   (Followers: 9)
Drug Testing and Analysis     Hybrid Journal   (Followers: 8)
Electroanalysis     Hybrid Journal   (Followers: 8)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
International Journal of Analytical Chemistry     Open Access   (Followers: 22)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 8)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 7)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 13)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 23)
Journal of Combinatorial Chemistry     Full-text available via subscription   (Followers: 1)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 6)
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry     Full-text available via subscription   (Followers: 1)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 3)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 8)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 24)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 2)
Microchemical Journal     Hybrid Journal   (Followers: 4)
Nature Catalysis     Hybrid Journal  
Nigerian Journal of Chemical Research     Full-text available via subscription   (Followers: 2)
Phytochemical Analysis     Hybrid Journal   (Followers: 3)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 10)
Sample Preparation     Open Access   (Followers: 1)
Surface and Interface Analysis     Hybrid Journal   (Followers: 16)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 56)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 3)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 13)
World Journal of Analytical Chemistry     Open Access   (Followers: 2)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.268]   [H-I: 23]   [23 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2351 journals]
  • Identification of Regions in Apomyoglobin that Form Intermolecular
           Interactions in Amyloid Aggregates Using High-Performance Mass
    • Authors: N. S. Katina; M. Yu. Suvorina; E. I. Grigorashvili; V. V. Marchenkov; N. A. Ryabova; A. D. Nikulin; A. K. Surin
      Pages: 1271 - 1279
      Abstract: The formation of amyloid aggregates in human organs and tissues causes the development of incurable diseases. However, experimental studies of the mechanism of amyloid formation by proteins and the structural characteristics of amyloids are complicated because of the heterogeneity and high molecular weight of the aggregates. We used limited proteolysis and mass spectrometry for the identification of regions in the apomyoglobin polypeptide chain, which give rise to intermolecular interactions in amyloid structures. Tandem mass spectroscopy enabled the identification of regions in the myoglobin polypeptide chain, which form the core of amyloid structures. It was shown that the main structural elements for the formation of the core of amyloid fibrils in myoglobin were regions from 60 through 90 and from 97 through 124 amino acid residues. These regions coincide well with those theoretically predicted. This approach yielded important data on the structure of protein molecules in aggregates and on conformational rearrangements of apomyoglobin upon amyloid formation.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130056
      Issue No: Vol. 72, No. 13 (2017)
  • Mass Spectrometric Detection of Charged Silver Nanoclusters with Hydrogen
           Inclusions Formed by the Reduction of AgNO 3 in Ethylene Glycol
    • Authors: O. A. Boryak; M. V. Kosevich; V. V. Chagovets; V. S. Shelkovsky
      Pages: 1289 - 1294
      Abstract: In the problem of the production silver nanoparticles, mass spectrometry allows one to identify nanoclusters as nuclei or intermediates in the synthesis of nanoparticles and to understand the mechanisms of their formation. Using low-temperature secondary emission mass spectrometry, we determined the cluster composition of a system formed in the microwave treatment of a solution of AgNO3 in ethylene glycol (M). Along with silver ion–ethylene glycol associates М m ⋅ Ag+ (m = 1–5) and small silver clusters AgM n + (n = 1–9), unusual silver clusters with one hydrogen atom [Ag n H]+ (n = 2, 4) were observed. Possible pathways for the formation of silver nanoparticles taking into account hydrogen-containing cluster intermediates are discussed.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130032
      Issue No: Vol. 72, No. 13 (2017)
  • Tryptamine: a Reactive Matrix for MALDI Mass Spectrometry
    • Authors: M. S. Slyundina; N. Yu. Polovkov; R. S. Borisov; V. G. Zaikin
      Pages: 1295 - 1299
      Abstract: A possibility of using tryptamine as a reactive matrix for the analysis of non-polar carbonyl compounds by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry has been shown. Presence of a terminal primary amine group in the tryptamine molecule predetermines the formation of Schiff bases from aliphatic and alicyclic carbonyl compounds. No additional matrix compounds are necessary to register MALDI mass spectra, because the excess of the derivatization agent plays the role of a matrix. MALDI mass spectra demonstrate high efficiency of desorption/ionization of the derivatives. To discover reactive matrices, a set of aromatic primary amines (mainly substituted anilines) has been tested, but they have not demonstrated matrix properties.
      PubDate: 2017-12-01
      DOI: 10.1134/s106193481713010x
      Issue No: Vol. 72, No. 13 (2017)
  • Disentangling of Information About the Structure of Biomolecules Based on
           the Decomposition and Separation of Two-Dimentional Charge Distributions
           of Ions
    • Authors: V. V. Raznikov; M. O. Raznikova; M. L. Pridatchenko
      Pages: 1300 - 1306
      Abstract: Electrospray ionization mass spectra of biomolecules typically consist of a series of multiply charged ions because of the transfer of protons or other charge carriers between ions of biomolecules and the surrounding liquid or gas. The distribution of intensities of ions retained charge carriers contains information about the spatial structure of biomolecules. A new method is developed for the separation and decomposition of multidimensional charge distributions of ions bearing other charge carriers, such as alkali metal ions, along with protons. The proposed method ensures the estimation of the probability of charge carrier retention by separate functional groups for the selected conformations of biomolecules. The paper describes the application of this method to the analysis of a two-dimensional charge distribution of horse heart cytochrome C, resulting in the revelation of at least two its structural forms under the studied conditions.
      PubDate: 2017-12-01
      DOI: 10.1134/s106193481713007x
      Issue No: Vol. 72, No. 13 (2017)
  • Determination of Methylphosphonic Acid in Human Blood Plasma by
           High-Performance Liquid Chromatography–Tandem Mass Spectrometry
    • Authors: T. M. Baygildiev; I. A. Rodin; A. N. Stavrianidi; A. V. Braun; O. A. Shpigun; I. V. Rybalchenko
      Pages: 1307 - 1311
      Abstract: Using high-performance liquid chromatography combined with tandem mass spectrometric detection, an approach has been developed for the determination of the most stable nerve agent biomarker, methylphosphonic acid, in human blood plasma. The proposed method is based on the derivatization of methylphosphonic acid with p-bromophenacyl bromide. The optimization of conditions for human plasma sample preparation, mass spectrometric detection conditions, and gradient elution program has been performed. The proposed approach has demonstrated satisfactory reproducibility and selectivity of the determination; the limit of detection for methylphosphonic acid in human plasma was 3 ng mL–1.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130020
      Issue No: Vol. 72, No. 13 (2017)
  • Gas-Phase Fragmentation Studies of Biotinylated, Hexaethylene
           Glycol–Spacered Oligosaccharides—Molecular Probes—Using Electrospray
           Mass Spectrometry on a Hybrid High-Resolution Mass Spectrometer
    • Authors: A. O. Chizhov; D. A. Argunov; M. L. Gening; E. V. Sukhova; E. A. Khatuntseva; A. A. Karelin; B. S. Komarova; M. V. Orekhova; V. B. Krylov; D. V. Yasunskii; Yu. E. Tsvetkov; N. E. Nifantiev
      Pages: 1312 - 1321
      Abstract: The electrospray ionization high-resolution mass spectra of biotinylated hexaethylene glycol–spacered molecular probes bearing biologically relevant carbohydrate moieties in positive and negative modes were recorded and interpreted. Collisionally induced decay mass spectra (positive mode) revealed different patterns depending on the charge of the parent ion, attached cations (or ions), the composition, and the sequence of carbohydrate fragments. The most intense peaks (two series) originated from the sequential cleavage of glycoside bonds resulting in charge location on the reducing end (Y series observed for all of the test compounds) or nonreducing end (B series). Hexaethylene glycol chain fragmentation giving rise to the cleavage of the C–O bond remote from the biotin moiety was observed. Other fragment ions lighter than the above by a difference of (C2H4O) n were absent or much smaller. Similar fragmentation was found for all of the nonsulfated biotinylated glycosides with the hexaethylene glycol spacer thus demonstrating that this type of fragmentation was characteristic of such molecular probes. Similar cleavages along with biotin moiety decay via the elimination of H2S and H2CS were observed for negative ions in the collisionally induced decay mass spectra of sulfated and neutral molecular probes.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130044
      Issue No: Vol. 72, No. 13 (2017)
  • Interpretation and Simulation of Negative Ion Mass Spectra of Some
           Phosphorus Organoelement Compounds
    • Authors: A. G. Terentyev; R. V. Khatymov; M. A. Lyogkov; A. V. Dudkin; I. V. Rybal’chenko
      Pages: 1322 - 1330
      Abstract: Negative ion mass spectra for a series of organophosphorus compounds were obtained and negative ion fragmentation processes were treated theoretically. Using O-isopropyl and O-pinacolyl methylphosphonofluoridates as examples, electron affinities of molecules and their fragments were estimated using the UB3LYP/6-311+G(d,p) quantum-chemical approach and energetically more favorable and characteristic routes of dissociative electron attachment, including simple bond cleavage and rearrangements, were determined. Based on the obtained experimental and theoretical data, hypothetic fragmentation patterns were proposed and a special algorithm was compiled to predict negative ion mass spectra for some groups of organophosphorus compounds, such as О-alkyl methylphosphonofluoridates, О,О-alkyl phosphonodichloridates, and О,О′-dialkyl phosphonochloridates. The simulated mass spectra showed a good agreement with the experimental ones, confirming reasonable reliability of the proposed algorithm.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130135
      Issue No: Vol. 72, No. 13 (2017)
  • Study of Gaseous Sample Ionization by Excited Particles Formed in Glow
           Discharge Using High-Resolution Orthogonal Acceleration Time-of-Flight
           Mass Spectrometer
    • Authors: I. V. Sulimenkov; V. S. Brusov; V. V. Zelenov; M. G. Skoblin; V. V. Filatov; A. R. Pikhtelev; V. I. Kozlovskii
      Pages: 1331 - 1339
      Abstract: The experimental results of a mass spectral analysis of volatile organic compounds in a gaseous sample, obtained using an original design of an ion source based on the Penning ionization of a gas sample by excited metastable inert gas atoms, are presented. Using ANSYS software, a gas-dynamic simulation of reagent gas flow from discharge zone to ionization region was carried out to analyze the effect of gas flow profile on the transport of metastable atoms and ionization efficiency. The n-octane and toluene samples diluted with helium at 100 ppb mole concentrations were used for our experiments. The resulting mass spectra of n-octane and toluene samples containe far more intensive molecular ions in comparison to n-octane and toluene electron ionization mass spectra from the NIST database. The sensitivity of 5 ions per 1 pg and 130 ions per 1 pg was achieved for n-octane and toluene molecular ions using the developed ion source combined with our mass spectrometer. The corresponding detection limits are 2.3 pg s–1 for n-octane molecular ions and 0.08 pg s–1 for toluene molecular ions. The detection limit for the reported ion source was considered theoretically.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130111
      Issue No: Vol. 72, No. 13 (2017)
  • Elucidation of the Chemical Structure of a Gas Chromatographic Artifact of
           Synthetic Cannabinoid N
           -(1-Carbamoyl-2-Methylpropyl)-1-(Cyclohexylmethyl)-1 H
           -Indazol-3Ccarboxamide by High-Resolution Mass Spectrometry
    • Authors: Vadim A. Shevyrin
      Pages: 1340 - 1344
      Abstract: Synthetic cannabinoids are the most popular psychoactive compounds on the illegal market. In the gas chromatographic determination, some synthetic cannabinoids undergo chemical transformations because of their thermal interaction with the chromatographic system. This paper is devoted to the elucidation of the structure of a gas chromatographic artifact formed from synthetic cannabinoid N-(1-carbamoyl-2-methylpropyl)-1-(cyclohexylmethyl)-1H-indazol-3-carboxamide as a result of dehydration of its terminal carbamoyl moiety. The chemical structure of the artifact is determined by high-resolution mass spectrometry.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130093
      Issue No: Vol. 72, No. 13 (2017)
  • Possibilities for Energy Pumping in a Radio-Frequency Quadrupole by
           Shifted Supersonic Gas Jet. Part I: Accelerated and Excited Atom
    • Authors: V. V. Raznikov; V. V. Zelenov; E. V. Aparina; A. R. Pikhtelev; I. V. Sulimenkov
      Pages: 1345 - 1349
      Abstract: Generation of an ion beam and its transmission into a mass analyzer is one of central problems in mass spectrometry. The use of a narrowly directed supersonic gas jet has a number of advantages in comparison with other sampling methods. The aim of this work was to confirm the declared earlier properties of the jet formed at the outlet of a cylindrical channel when the free path length of gaseous atoms at the beginning of the channel is comparable with the channel diameter. The paper describes the ability of such a supersonic jet to conserve an additional energy of jet gas atoms. A significant influence of the temperature of the gas flow on the yield of cyclohexane fragment ions was found, cyclohexane being an admixture in the noble gas jet passing through an electron ionization ion source. A possibility of obtaining a flow of metastable electronically excited atoms inside the jet is also shown. The results of the work confirm the availability of the supersonic gas jet for the design of a high efficiency ion source inside the radio-frequency quadrupole at the input of the mass analyzer.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130081
      Issue No: Vol. 72, No. 13 (2017)
  • A New Approach to Increasing the Resolution of a Mass Spectrometer with
           Wedge-Shaped Reflectors
    • Authors: E. A. Sysoeva; A. V. Spakhov; Alexander A. Sysoev
      Pages: 1350 - 1353
      Abstract: The paper describes the investigation of the ion-optical properties of a laser TOF mass spectrometer including two successively positioned wedge-shaped ion mirrors. Some specific properties of the configuration of ion trajectories near their reflection in the second ion reflector are found. The dependence of aberrations on ion energy acquired toothed shape for the resolution of the analyzer higher than 3000–5000. The approximation of the dependence gave a 15th degree polynomial. The calculation of polynomial coefficients showed a great contribution to the duration of ion packets for aberrations of higher order. The discovered features allowed us to suggest a way of the local correction of nearby trajectories in the total ion flux. By correcting the local motion of individual groups of ions, we could reduce temporary aberration to 1–1.6 ns, depending on ion energy. For the time of ion flight ~35 μs, such duration limits the resolution of the analyzer by a value not less than 10000. The real length of ion drift path was about 30 cm. The total overall sizes of the ionoptical system were ~24 × 19 × 5 cm.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817130123
      Issue No: Vol. 72, No. 13 (2017)
  • Triangular silver nanoplates as a spectrophotometric reagent for the
           determination of mercury(II)
    • Authors: A. A. Furletov; V. V. Apyari; A. V. Garshev; S. G. Dmitrienko; Yu. A. Zolotov
      Pages: 1203 - 1207
      Abstract: The applicability of triangular silver nanoplates (TNPs) as a spectrophotometric reagent for the determination of mercury(II) in an aqueous solution was estimated. The method is based on the oxidation of TNPs with a mean edge length of 52 nm and thickness of 4 nm by mercury(II) ions, which is accompanied by a decrease in the surface plasmon resonance of nanoparticles. The effect of reaction time, pH of solution, and TNP concentration on the sensitivity of mercury(II) determination was studied. The limit of mercury(II) detection under the selected conditions was 0.022 μg/mL.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120061
      Issue No: Vol. 72, No. 12 (2017)
  • Determination of copper in urine by diffuse reflectance spectroscopy
    • Authors: V. P. Dedkova; O. P. Shvoeva; A. A. Grechnikov
      Pages: 1208 - 1211
      Abstract: A possibility of determining copper(II) after adsorption on polyacrylonitrile fiber filled with a KU-2 cation exchanger with immobilized 1-(2-pyridylazo)-2-naphthol (PANF–KU-2–PAN) is studied. The diffuse reflectance spectra of the carrier discs before and after the adsorption of copper in the batch mode are recorded. The dependences of the analytical signals of the copper complex on PANF–KU-2–PAN on adsorption conditions are studied. The conditions for determining 0.05–0.40 μg/mL of copper(II) by measuring diffuse reflection coefficient at 640 nm or visually by a color scale after the adsorption of copper from 20 mL of a solution containing 0.01 M of HCl are found. The determination of 0.1 μg/mL of copper does not interfered with equal amounts of Co, Zn, and Pb and double amounts of Ag, Fe(III), Cd, Mn(II), Bi(III), and Cr(III). The procedure is used for urine analysis. The following conditions of the preparation of urine samples for the determination of copper were selected: boiling with hydrogen peroxide followed by acidification to pH 2. A procedure for determining copper in urine with a limit of detection of 0.03 μg/mL was developed; the relative standard deviation does not exceed 25%; the duration of analysis of 5–6 samples is 30–35 min.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120048
      Issue No: Vol. 72, No. 12 (2017)
  • Spectrophotometric determination of proteins in biological fluids
    • Authors: P. V. Anisimovich; T. B. Pochinok; E. V. Tokareva
      Pages: 1212 - 1218
      Abstract: A comparative analysis of procedures of the spectrophotometric determination of total protein with various organic dyes, Bromocresol Green, Bromophenol Blue, and Pyrogallol Red, in biological fluids is presented. It is shown that the results of determination with various dyes can differ because of the specific features of reagent interaction with the components of biological fluids. A new organic reagent, Bromopyrogallol Red, possessing equal sensitivity to different protein fractions (albumins and globulins) and ensuring a minimum error of the determination of total protein in clinical examinations using calibration solutions of various compositions is proposed. A procedure for the determination of total protein in biological fluids is developed and tested on real samples of urine and blood serum.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120024
      Issue No: Vol. 72, No. 12 (2017)
  • Identification of polyethanolamines by chromatography–mass
    • Authors: M. V. Shashkov; E. E. Sergeev
      Pages: 1219 - 1225
      Abstract: Presumable structures of polyethanolamines, synthesized by the catalytic β-hydroxyethylation of ammonia with an excess of ethylene oxide are determined by gas chromatography–electron ionization mass spectrometry and tandem mass spectrometry qualitatively, following fragmentation ways and also taking into account retention data. The preferable paths of consecutive reactions of the synthesis of polyethanolamines in a homologous series of isomers are found.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120103
      Issue No: Vol. 72, No. 12 (2017)
  • Adsorption and selective properties of
           4-{4-[4(S)-2-methyl-1-butoxybenzoyloxy]phenyldiazenyl}benzaldehyde in
           gas–mesophase chromatography
    • Authors: S. A. Kuvshinova; G. V. Kuvshinov; O. I. Koifman
      Pages: 1226 - 1232
      Abstract: Adsorption of 16 organic compounds from the gas phase by 4-{4-[4(S)-2-methyl-1-butoxybenzoyloxy]phenyldiazenyl}benzaldehyde was studied by gas chromatography. It was shown by means of differential scanning calorimetry that 4-{4-[4(S)-2-methyl-1-butoxybenzoyloxy]phenyldiazenyl]benzaldehyde is an enantiotropic polymorphic mesogen and forms smectic and nematic liquid crystal phases. Electron-donor isomers of methylpyridine and dimethylpyridine, isomers of weakly polar xylenes and cresols, and enantiomers of 2,3-butanediol and terpene hydrocarbons, capable of various types of intermolecular interactions with mesogenic aldehyde, were selected as adsorbates. Specific retention volumes of adsorbates and criteria for their separation were calculated. The effect of temperature and chemical nature of the adsorbates on their adsorption redistribution in the gas–liquid crystal system is discussed. It was found experimentally that the adsorbent based on 4-{4-[4(S)-2-methyl-1-butoxybenzoyloxy]phenyldiazeny}lbenzaldehyde exhibits high selectivity for close-boiling organic compounds of various nature and good efficiency and productivity in their separation.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120073
      Issue No: Vol. 72, No. 12 (2017)
  • Determination of alkyl- and alkanolamines in drinking and natural waters
           by capillary electrophoresis with isotachophoretic on-line
    • Authors: Yu. Malinina; M. Ya. Kamentsev; L. N. Moskvin; N. M. Yakimova; I. D. Kuchumova
      Pages: 1239 - 1242
      Abstract: A procedure is developed for the determination of several amines in drinking and natural waters by capillary electrophoresis with isotachophoretic on-line preconcentration without sample preparation. A background electrolyte based on acridine as an absorbing ion is proposed for analysis with isotachophoretic on-line preconcentration and indirect photometric detection. The sample was injected in the hydrodynamic mode. The procedure was tested on drinking and natural water samples. The accuracy of data obtained was confirmed by the added–found method. The analytical range was from 0.25 to 5 mg/L. The time of one analysis was 5–6 min.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120085
      Issue No: Vol. 72, No. 12 (2017)
  • Elimination of the interfering effect of hydrogen on the determination of
           palladium by stripping voltammetry
    • Authors: N. A. Kolpakova; S. M. Panova; Yu. A. Os’kina; Zh. K. Sabitova
      Pages: 1251 - 1254
      Abstract: The effect of hydrogen on the electrooxidation current of a palladium–hydrogen precipitate is studied. It is shown that the UV irradiation of the solution changes the mechanism of the formation of molecular hydrogen in the electrochemical deposition of palladium. A procedure is developed for determining palladium in platinum metal preconcentrates by stripping voltammetry.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817100070
      Issue No: Vol. 72, No. 12 (2017)
  • Identification of endogenous and anthropogenic hydrocarbons in bottom
           deposits of peat lakes and evaluation of their contribution to the
           “hydrocarbon index”
    • Authors: E. S. Brodskii; A. A. Shelepchikov; E. Ya. Mir-Kadyrova; G. A. Kalinkevich
      Pages: 1255 - 1262
      Abstract: Gas chromatography with mass spectrometric detection was used to analyze bitumens isolated from bottom sediments of peat lakes contaminated with petroleum products. Endogenous hydrocarbons are characterized by the presence of n-alkanes with an odd number of carbon atoms in the molecule in the characteristic region of C23–C33, the absence of a “hump” characteristic of oil products in the chromatogram, and the presence of light hydrocarbons, eluting in the initial part of the chromatogram (light hydrocarbons are usually lost when the sample is dried). The distribution profile of odd n-alkanes is used to assess the contribution of endogenous hydrocarbons to the “hydrocarbon index” with the help of the pattern recognition method. The concentration of light hydrocarbons is from 50 and 300–400 to 3500–5000 mg/kg for a number of samples and even up to 26000 mg/kg in some samples. The concentration of petroleum hydrocarbons and heteroatomic compounds varies from the lowest values of 30–80 mg/kg up to 20000 mg/kg and higher.
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817120036
      Issue No: Vol. 72, No. 12 (2017)
  • A rapid field test method for the determination of hydrogen sulfide and
           sulfides in waters with gas preextraction
    • Authors: M. O. Gorbunova; E. M. Bayan
      Pages: 1263 - 1269
      Abstract: A rapid test method was developed for the determination of hydrogen sulfide and sulfides in waters using a potassium chloride-impregnated test paper with color intensity evaluation of the formed CdS zone by colorimetry and diffuse reflectance spectroscopy. The determination conditions, viz. acidity, gas preexraction time, air pumping rate, and working concentration range (0.005–0.16 mg of Н2S/L), were optimized. The procedure proposed is easy-to-perform, and the time of single determination is 20 min; in addition, the procedure is cost effective, sensitive, selective, does not require expensive equipment and expertise of executor, and is not inferior in accuracy to photometric methods. The procedure was tested on real water samples. The concentration hydrogen sulfide in the Don and Temernik rivers in Rostov-on-Don is not higher than the maximum permissible concentration (MPC).
      PubDate: 2017-12-01
      DOI: 10.1134/s1061934817100057
      Issue No: Vol. 72, No. 12 (2017)
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Heriot-Watt University
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